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From:   Neil Armstrong <neil.armstrong@linaro.org>
Date:   Tue, 03 Oct 2023 09:10:19 +0200
Subject: [PATCH v4 1/5] dt-bindings: crypto: qcom,prng: document that RNG
 on SM8450 is a TRNG
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Message-Id: <20231003-topic-sm8550-rng-v4-1-255e4d0ba08e@linaro.org>
References: <20231003-topic-sm8550-rng-v4-0-255e4d0ba08e@linaro.org>
In-Reply-To: <20231003-topic-sm8550-rng-v4-0-255e4d0ba08e@linaro.org>
To:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Vinod Koul <vkoul@kernel.org>
Cc:     linux-arm-msm@vger.kernel.org, linux-crypto@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Om Prakash Singh <quic_omprsing@quicinc.com>
Precedence: bulk

It has been reported at [1] the RNG HW on SM8450 is in fact a True Random
Number Generator and no more Pseudo, document this by adding
a new qcom,trng and the corresponding SoC specific sm8450 compatible.

[1] https://lore.kernel.org/all/20230818161720.3644424-1-quic_omprsing@quicinc.com/

Suggested-by: Om Prakash Singh <quic_omprsing@quicinc.com>
Suggested-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Om Prakash Singh <quic_omprsing@quicinc.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
---
 .../devicetree/bindings/crypto/qcom,prng.yaml      | 25 +++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/crypto/qcom,prng.yaml b/Documentation/devicetree/bindings/crypto/qcom,prng.yaml
index bb42f4588b40..04ddcc0f7165 100644
--- a/Documentation/devicetree/bindings/crypto/qcom,prng.yaml
+++ b/Documentation/devicetree/bindings/crypto/qcom,prng.yaml
@@ -11,9 +11,14 @@ maintainers:
 
 properties:
   compatible:
-    enum:
-      - qcom,prng  # 8916 etc.
-      - qcom,prng-ee  # 8996 and later using EE
+    oneOf:
+      - enum:
+          - qcom,prng  # 8916 etc.
+          - qcom,prng-ee  # 8996 and later using EE
+      - items:
+          - enum:
+              - qcom,sm8450-trng
+          - const: qcom,trng
 
   reg:
     maxItems: 1
@@ -28,8 +33,18 @@ properties:
 required:
   - compatible
   - reg
-  - clocks
-  - clock-names
+
+allOf:
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              const: qcom,trng
+    then:
+      required:
+        - clocks
+        - clock-names
 
 additionalProperties: false
 

-- 
2.34.1